Time gas-lighting mechanism.



No. 755,060. 'PAIENTBD MAR. 22,1904.

N. H. SHAW.

. TIME GAS LIGHTING MEGHANISM. APPLIUATIQH Hmm A rn. 14. 1903.

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PATENTBD MAR. 22, 1904. N. H. SHAW.

TIME GAS LIGHTING MECHANISM. APPLIQATION FILED APB. 14. 190s.

2 SHEETS-SHEET 2.

Inmo/liar;

UNITED STATES Patented March 22, 1904i.

NATHANIEL H. SHAW, OF BOSTON, MASSACHUSETTS.

TIME GAS-LIGHTING MECHANISM. l

SPECIFICATION forming part of Letters Patent No. 755,060, dated March22, 1904.

VApplication filed April 14, 1903. Serial No. 152,544. (No model.) i

' Boston, county of Suffolk'State of Massachusetts, have made certainnew and useful Improvements in Automatic Gas Lighting and ExtinguishingApparatus, of which the following is a description suciently full,clear, and

exact to enable any person skilled in the art or science to which saidinvention appertains to make and use the same, reference being had tothe accompanying drawings, in which- Figure 1 is a front elevationshowing the time mechanism on burner of my improved device; Fig. 2, across-sectionalview enlarged showing the connectionY between the burnerand time mechanism; Fig. 3, a section on line 3 3 in Fig. 2, showing themain and pilot-valve operating mechanism; Fig. 4, asection on line 4 4:in Fig. 2, illustrating details; Fig. 5, a sectional view showing thepilot-duct gage, 'and Fig. 6 a face view of the tripping-disk.

Like letters and iigures of reference indicate corresponding parts inthe different figures of the drawings.

My invention relates more especially to automatic gas lighting andextinguishing mechanism for street-lamps using illuminating-gas, andparticularly such as are supplied with a mantle or Bunsen or what iscommonly known as a Welsbach burner. peculiar construction of suchburners and the disposition of the protecting-lantern much difficultyhas heretofore been experienced in so locating the device as to take thesupply from the top of the pipe from which the burner projectsvertically and interposing a valve mechanism operated automatically by atime mechanism which shall not interfere with the common or ordinaryarrangement of the parts and yet shall prove effective in notobstructing the light rays in the lantern. My invention is designed toaccomplish 'this in the simplest, cheapest, and most effective manner,and in carrying it outI makeV use of means which will be readilyunderstood by those conversant with such matters from the followingexplanation.

In the drawings, A represents the casing of a clock or time mechanismwhich carries the Because of the by its base into the discharge-nipple18.

works of aclock of ordinary construction, by

which is driven an intermediate gear b, mesh-- ing with a gear c,suitably journaled in said casing. On the rear face of this gear cproject studs, (indicated by'do'tted circles on the face of said gear inFig. 1,) disposed at determined intervals for the purpose of tripping orelevating the free end ofa counterbalanced lever e at predeterminedintervals in the clocks course. On this lever e is pivoted to playvertically a hook-shaped bell-crank or pawl f, counterbalanced at g. l

Journaled in the case is a disk j, bearing on its outer face a series ofstudslc in position to be engaged by the hook f, wherebysaid disk may berotated intermittently a determined distance. Of these studs alternateones project rearwardly through said disk, formingv lingers Z.

A lever 7L, counterbalanced on its free end at 50, is pivoted to therear wall of the casing A, with its long arm projecting into the path ofthese ngers Z, and a pitman-rod c' is pivoted to said long arm.

A casting, right angular 1n the present instance, but which may be ofany requisite form, is provided with a nipple 17, whereby it may beattached to the top of the vertical supply-pipe usual in lamp-posts.This casting forms a gas-conduit H and is provided with a port or duct19, leading laterally at right angles from the nipple 17, thencevertically downward, and again horizontally, whence it discharges into agas-chamber B, bolted to the rear wall of the casing A. The conduit H isbolted to this chamber and serves to support the time mechanism on thepost.

Opening through a partition in the top of the gas-chamber B are twovalve-seats 20 and 25, connecting said chamber, respectively, with adischarge port or duct 22 and a pilotlight port or duct 15, formed insaid conduit H and for convenience in parallelism with the inlet 19. Thedischarge 22 Vterminates-in a vertical nipple 18, directly above and inalinement with the inlet-nipple 17.

The burner D, which is of the ordinary familiar form ofburners of thisclass, is turned It has the usual head y for receiving the mantle a: andair-ports 16, covered by hood z, for admitti ng air to themixing-chamber. Through this hood and head the pilot-light tube 15 isextended vertically from the conduit to discharge inside the mantle Agage screw or regulator 23 is turned through the end of the conduit andhas its conical end projecting into the horizontal portion of theoutlet-port 22, where it enters theJ discharge-nipple 18. By means ofthis the flow of gas to the burner may be regulated, as will be readilyunderstood. A similar gage-screw 31 (see Fig. 5) regulates the flow inthe pilot-pipe.

Fitted to slide in a tube q, projecting through the top of thegas-chamber B, (see Fig. 3,) there is a rod j), the upper end.of whichis secured to an arm m, which passes through an opening in the rear wallof the clock-casing A and has-its end pivotally connected to the pitmanThe lower end of this rod p within the gas-chamber carries a shelf orbracket o, upon which is mounted a mercury-cup s, fitted to slide ontube q, theinner end of which projects into the mercury, whereby it issealed against the escape of gas from said chamber.

The bracket fr carries a stem t, on which is a valve w, adapted to movevertically upward and be seated on seat 2O and cut off the fiow of gasfrom chamber B to the discharge 19. A similar stem 33 is arranged on theopposite end of bracket r and carries valve lv, fitted to engage theupper side of seat 25 and cut off the supply from chamber B to thepilot. The valves as thus adjusted are alternately opened and closed,the downward movement of rod p admitting the gas-supply to the mainburner and cutting off that to the pilot and its upward movement openingthe pilot and cutting off the main burner-supply.

As is well known, the lantern (indicated in dotted outline in Fig. 1)housing the burner of street-lamps is supported from the posttop, andits base transects the base of said burner, a torch hole or openingbeing formed in the base of the lantern. By means of thelaterally-projecting conduit, which forms a gas-circuit between thesupply and the base of the burner, only the horizontal upper portion ofsaid conduit is inclosed in the lantern, said conduit dropping andsupporting the time mechanism;` By this construction, which I deem asalient feature of my invention, I am enabled alsoto dispose lallvalvemechanism outside and below the lantern, the base of which issubstantially horizontally across the nipple 17. I do not confine myselfto the use of the time mechanisml shown or to the specific form of valvemechanism and the actuating devices described, as these valves Q: w maybe mounted on opposite sides of the seats. The seal may be made to workabove the top of the chamber and any suitable timeactuated deviceemployed to operate them.

Moreover, the pilot-valve may be entirely omitted, if desired, and acontinuous flow permitted from the chamber to the pilot-burner, whichcan, as its outlet is within the main burner, be allowed to burn at alltimes without greater consumption of gas than would occur should thepilot-supply be shut off when the main burner is ignited.

rlhe operation of the mechanism as shown is as follows: The clock beingin action, at a predetermined time a stud on the gear o will engage thefree arm of lever e, elevating the same and driving the pawl f upwarduntil it overrides a stud c, the preceding finger Z having been restingon the end 'of lever /L and holding it depressed, as in Fig. 1, on thedownstroke, and consequently holding the supplyvalve w open and thepilot-valve o closed, as in Fig. 3, with the main burner (in which gashas been ignited from said pilot) being in full operation. Now as soonas the stud disengages the lever e said lever descends by gravity, itbeing pivoted by its opposite end, carrying with it pawl f, whichrotates disk] the distance between a linger Z and stud ,t and frees thelever /L from contact with the preceding finger, whereupon thecounterbalance 50 at once drives the forearm of said lever 7L upwarduntil stopped by the seating of the main burner-valve. At the time thepitmanzl is forced upward it opens the pilotvalve o, the burner of whichis at once ignited, and consequently closes the supply-valve w andextinguishes the main burner. The opposite of this operation occurs atfurther course of the clock when Aa succeeding stud elevates lever e.The pawl f this time engages an alternate stud driving the lever L,already inl engagement while elevated with a finger Z downward andactuating the valve mechanism to assume the positions shown in thedrawings with the main burner-supply open and the.4 lever e helddepressed by the contacting finger Z.

Having thus explained my invention, what I claim isy i 1. In a device ofthe class described a burner; a gas-conduit connecting with the mainsupply adjacent its outlet, projecting laterally from said supply andreturning to discharge into said burner; a valve interposed in saidconduit: and a time mechanism for operating said valve.

2. In adevice of the character described the burner in combination withthe angular conduit, H, projecting laterally and downwardly from thebase thereofand provided with ducts 19 and 22 arranged substantially asspecified: a valve connecting said ducts: and av time mechanism foroperating said valve.

3. In combination, the burner, the gasehamber: the angular gas-conduitprojecting laterally and downwardly therefrom and provided with the mainand pilot-light vducts IIO opening into said gas-chamber: Valvesinterposed between said ducts within said chamber: and a time mechanismon said conduit for operating said Valves substantially in the mannerspecied.

4. The supply, the burner, the pilot-burner and the lantern housing thesame in combination with the gas-conduit having ducts connecting saidsupply with said burners Within said housing and projecting laterallyand downwardly therefrom outside said housing:

valves interposed between the supply and burner ducts: and a timemechanism on said conduit for operating said Valves substantially asdescribed.

In testimony whereof Ihave aflixed my signature in presence of twowitnesses.

NATHANIEL H. SHAW.

Witnesses:

O. M. SHAW, JOHN B. Moons.

